class_docstr: Tag object associated with an experiment.
code: def to_proto(self):
      param = ProtoExperimentTag()
      param.key = self.key
      param.value = self.value
      return param
  
file_path: mlflow/mlflow/entities/experiment_tag.py
imports: from mlflow.entities._mlflow_object import _MLflowObject
  from mlflow.protos.service_pb2 import ExperimentTag
label_desc: Use image node_id 5 for calling the ExperimentTag obj's underlying member method code with example usage: obj.to_proto() and returns: param